A Quasi Two Dimensional Model of Transport Phenomena in Diesel Particulate Filters - The Effects of Particle Diameter on the Pressure Drop in DPF Regeneration Mode-

Experimental and numerical studies on the combustion of the particulate matter in the diesel particulate filter with the particulate matter loaded under different particulate matter loading condition were carried out. It was observed that the pressure losses through diesel particulate filter loaded with particulate matter having different mean aggregate particle diameters during both particulate matter loading and combustion periods. Diesel particulate filter regeneration mode was controlled with introducing a hot gas created in Diesel Oxidation Catalyst that oxidized hydrocarbon injected by a fuel injector placed on an exhaust gas pipe. The combustion amount was calculated with using a total diesel particulate filter weight measured by the weight meter both before and after the particulate matter regeneration event. Particulate matter loaded in the larger mean aggregate particle diameter condition is oxidized slower than that in the smaller mean aggregate particle diameter condition. It is confirmed with the fact that the pressure drop through the diesel particulate filter with the particulate matter loaded in the smaller mean aggregate particle diameter condition decreased more than the larger mean aggregate particle diameter condition during diesel the particulate filter regeneration phase. The pressure drop behavior through the diesel particulate filter loaded with above-mentioned both the smaller and larger mean aggregate particle diameter condition in the diesel particulate filter regeneration driving mode was precisely predicted with a numerical thermic fluid analysis code. Particulate matter combustion reaction constant calibrated with experimental results shows that the activation energy of the larger mean aggregate particle diameter condition is smaller than the smaller mean aggregate particle diameter condition. The same code expresses that the difference of the particulate matter combustion amount between each mean aggregate particle diameter condition.